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linux_dsm_epyc7002/arch/powerpc/mm/tlb-radix.c
Aneesh Kumar K.V bd77c44986 powerpc/mm/radix: Use tlbiel only if we ever ran on the current cpu 
Before this patch, we used tlbiel, if we ever ran only on this core.
That was mostly derived from the nohash usage of the same. But is
incorrect, the ISA 3.0 clarifies tlbiel such that:

"All TLB entries that have all of the following properties are made
invalid on the thread executing the tlbiel instruction"

ie. tlbiel only invalidates TLB entries on the current thread. So if the
mm has been used on any other thread (aka. cpu) then we must broadcast
the invalidate.

This bug could lead to invalid TLB entries if a program runs on multiple
threads of a core.

Hence use tlbiel, if we only ever ran on only the current cpu.

Fixes: 1a472c9dba ("powerpc/mm/radix: Add tlbflush routines")
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-10-27 21:55:13 +11:00

427 lines
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/*
* TLB flush routines for radix kernels.
*
* Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/memblock.h>
#include <asm/ppc-opcode.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
static DEFINE_RAW_SPINLOCK(native_tlbie_lock);
#define RIC_FLUSH_TLB 0
#define RIC_FLUSH_PWC 1
#define RIC_FLUSH_ALL 2
static inline void __tlbiel_pid(unsigned long pid, int set,
unsigned long ric)
{
unsigned long rb,rs,prs,r;
rb = PPC_BIT(53); /* IS = 1 */
rb |= set << PPC_BITLSHIFT(51);
rs = ((unsigned long)pid) << PPC_BITLSHIFT(31);
prs = 1; /* process scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("ptesync": : :"memory");
}
/*
* We use 128 set in radix mode and 256 set in hpt mode.
*/
static inline void _tlbiel_pid(unsigned long pid, unsigned long ric)
{
int set;
for (set = 0; set < POWER9_TLB_SETS_RADIX ; set++) {
__tlbiel_pid(pid, set, ric);
}
return;
}
static inline void _tlbie_pid(unsigned long pid, unsigned long ric)
{
unsigned long rb,rs,prs,r;
rb = PPC_BIT(53); /* IS = 1 */
rs = pid << PPC_BITLSHIFT(31);
prs = 1; /* process scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
static inline void _tlbiel_va(unsigned long va, unsigned long pid,
unsigned long ap, unsigned long ric)
{
unsigned long rb,rs,prs,r;
rb = va & ~(PPC_BITMASK(52, 63));
rb |= ap << PPC_BITLSHIFT(58);
rs = pid << PPC_BITLSHIFT(31);
prs = 1; /* process scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIEL(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("ptesync": : :"memory");
}
static inline void _tlbie_va(unsigned long va, unsigned long pid,
unsigned long ap, unsigned long ric)
{
unsigned long rb,rs,prs,r;
rb = va & ~(PPC_BITMASK(52, 63));
rb |= ap << PPC_BITLSHIFT(58);
rs = pid << PPC_BITLSHIFT(31);
prs = 1; /* process scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
/*
* Base TLB flushing operations:
*
* - flush_tlb_mm(mm) flushes the specified mm context TLB's
* - flush_tlb_page(vma, vmaddr) flushes one page
* - flush_tlb_range(vma, start, end) flushes a range of pages
* - flush_tlb_kernel_range(start, end) flushes kernel pages
*
* - local_* variants of page and mm only apply to the current
* processor
*/
void radix__local_flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (pid != MMU_NO_CONTEXT)
_tlbiel_pid(pid, RIC_FLUSH_ALL);
preempt_enable();
}
EXPORT_SYMBOL(radix__local_flush_tlb_mm);
void radix__local_flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr)
{
unsigned long pid;
struct mm_struct *mm = tlb->mm;
preempt_disable();
pid = mm->context.id;
if (pid != MMU_NO_CONTEXT)
_tlbiel_pid(pid, RIC_FLUSH_PWC);
preempt_enable();
}
EXPORT_SYMBOL(radix__local_flush_tlb_pwc);
void radix__local_flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
int psize)
{
unsigned long pid;
unsigned long ap = mmu_get_ap(psize);
preempt_disable();
pid = mm ? mm->context.id : 0;
if (pid != MMU_NO_CONTEXT)
_tlbiel_va(vmaddr, pid, ap, RIC_FLUSH_TLB);
preempt_enable();
}
void radix__local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
{
#ifdef CONFIG_HUGETLB_PAGE
/* need the return fix for nohash.c */
if (vma && is_vm_hugetlb_page(vma))
return __local_flush_hugetlb_page(vma, vmaddr);
#endif
radix__local_flush_tlb_page_psize(vma ? vma->vm_mm : NULL, vmaddr,
mmu_virtual_psize);
}
EXPORT_SYMBOL(radix__local_flush_tlb_page);
#ifdef CONFIG_SMP
void radix__flush_tlb_mm(struct mm_struct *mm)
{
unsigned long pid;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
if (!mm_is_thread_local(mm)) {
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_pid(pid, RIC_FLUSH_ALL);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
} else
_tlbiel_pid(pid, RIC_FLUSH_ALL);
no_context:
preempt_enable();
}
EXPORT_SYMBOL(radix__flush_tlb_mm);
void radix__flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr)
{
unsigned long pid;
struct mm_struct *mm = tlb->mm;
preempt_disable();
pid = mm->context.id;
if (unlikely(pid == MMU_NO_CONTEXT))
goto no_context;
if (!mm_is_thread_local(mm)) {
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_pid(pid, RIC_FLUSH_PWC);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
} else
_tlbiel_pid(pid, RIC_FLUSH_PWC);
no_context:
preempt_enable();
}
EXPORT_SYMBOL(radix__flush_tlb_pwc);
void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
int psize)
{
unsigned long pid;
unsigned long ap = mmu_get_ap(psize);
preempt_disable();
pid = mm ? mm->context.id : 0;
if (unlikely(pid == MMU_NO_CONTEXT))
goto bail;
if (!mm_is_thread_local(mm)) {
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_va(vmaddr, pid, ap, RIC_FLUSH_TLB);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
} else
_tlbiel_va(vmaddr, pid, ap, RIC_FLUSH_TLB);
bail:
preempt_enable();
}
void radix__flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
{
#ifdef CONFIG_HUGETLB_PAGE
if (vma && is_vm_hugetlb_page(vma))
return flush_hugetlb_page(vma, vmaddr);
#endif
radix__flush_tlb_page_psize(vma ? vma->vm_mm : NULL, vmaddr,
mmu_virtual_psize);
}
EXPORT_SYMBOL(radix__flush_tlb_page);
#endif /* CONFIG_SMP */
void radix__flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_pid(0, RIC_FLUSH_ALL);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
}
EXPORT_SYMBOL(radix__flush_tlb_kernel_range);
/*
* Currently, for range flushing, we just do a full mm flush. Because
* we use this in code path where we don' track the page size.
*/
void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
radix__flush_tlb_mm(mm);
}
EXPORT_SYMBOL(radix__flush_tlb_range);
static int radix_get_mmu_psize(int page_size)
{
int psize;
if (page_size == (1UL << mmu_psize_defs[mmu_virtual_psize].shift))
psize = mmu_virtual_psize;
else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_2M].shift))
psize = MMU_PAGE_2M;
else if (page_size == (1UL << mmu_psize_defs[MMU_PAGE_1G].shift))
psize = MMU_PAGE_1G;
else
return -1;
return psize;
}
void radix__tlb_flush(struct mmu_gather *tlb)
{
int psize = 0;
struct mm_struct *mm = tlb->mm;
int page_size = tlb->page_size;
psize = radix_get_mmu_psize(page_size);
/*
* if page size is not something we understand, do a full mm flush
*/
if (psize != -1 && !tlb->fullmm && !tlb->need_flush_all)
radix__flush_tlb_range_psize(mm, tlb->start, tlb->end, psize);
else
radix__flush_tlb_mm(mm);
}
#define TLB_FLUSH_ALL -1UL
/*
* Number of pages above which we will do a bcast tlbie. Just a
* number at this point copied from x86
*/
static unsigned long tlb_single_page_flush_ceiling __read_mostly = 33;
void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
unsigned long end, int psize)
{
unsigned long pid;
unsigned long addr;
int local = mm_is_thread_local(mm);
unsigned long ap = mmu_get_ap(psize);
int lock_tlbie = !mmu_has_feature(MMU_FTR_LOCKLESS_TLBIE);
unsigned long page_size = 1UL << mmu_psize_defs[psize].shift;
preempt_disable();
pid = mm ? mm->context.id : 0;
if (unlikely(pid == MMU_NO_CONTEXT))
goto err_out;
if (end == TLB_FLUSH_ALL ||
(end - start) > tlb_single_page_flush_ceiling * page_size) {
if (local)
_tlbiel_pid(pid, RIC_FLUSH_TLB);
else
_tlbie_pid(pid, RIC_FLUSH_TLB);
goto err_out;
}
for (addr = start; addr < end; addr += page_size) {
if (local)
_tlbiel_va(addr, pid, ap, RIC_FLUSH_TLB);
else {
if (lock_tlbie)
raw_spin_lock(&native_tlbie_lock);
_tlbie_va(addr, pid, ap, RIC_FLUSH_TLB);
if (lock_tlbie)
raw_spin_unlock(&native_tlbie_lock);
}
}
err_out:
preempt_enable();
}
void radix__flush_tlb_lpid_va(unsigned long lpid, unsigned long gpa,
unsigned long page_size)
{
unsigned long rb,rs,prs,r;
unsigned long ap;
unsigned long ric = RIC_FLUSH_TLB;
ap = mmu_get_ap(radix_get_mmu_psize(page_size));
rb = gpa & ~(PPC_BITMASK(52, 63));
rb |= ap << PPC_BITLSHIFT(58);
rs = lpid & ((1UL << 32) - 1);
prs = 0; /* process scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
EXPORT_SYMBOL(radix__flush_tlb_lpid_va);
void radix__flush_tlb_lpid(unsigned long lpid)
{
unsigned long rb,rs,prs,r;
unsigned long ric = RIC_FLUSH_ALL;
rb = 0x2 << PPC_BITLSHIFT(53); /* IS = 2 */
rs = lpid & ((1UL << 32) - 1);
prs = 0; /* partition scoped */
r = 1; /* raidx format */
asm volatile("ptesync": : :"memory");
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(rs) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
EXPORT_SYMBOL(radix__flush_tlb_lpid);
void radix__flush_pmd_tlb_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
radix__flush_tlb_range_psize(vma->vm_mm, start, end, MMU_PAGE_2M);
}
EXPORT_SYMBOL(radix__flush_pmd_tlb_range);
void radix__flush_tlb_all(void)
{
unsigned long rb,prs,r,rs;
unsigned long ric = RIC_FLUSH_ALL;
rb = 0x3 << PPC_BITLSHIFT(53); /* IS = 3 */
prs = 0; /* partition scoped */
r = 1; /* raidx format */
rs = 1 & ((1UL << 32) - 1); /* any LPID value to flush guest mappings */
asm volatile("ptesync": : :"memory");
/*
* now flush guest entries by passing PRS = 1 and LPID != 0
*/
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(1), "i"(ric), "r"(rs) : "memory");
/*
* now flush host entires by passing PRS = 0 and LPID == 0
*/
asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
: : "r"(rb), "i"(r), "i"(prs), "i"(ric), "r"(0) : "memory");
asm volatile("eieio; tlbsync; ptesync": : :"memory");
}
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